.course{
    width:1080px;
    height:1920px;
    padding:0;
    margin:0 ;
    position: absolute;
    overflow: hidden;
}
footer{
    width: 1080px;
    height: 111px;
    position: absolute;
    bottom: 0px;
}
footer button{
    width: 270px;
    height: 111px;
    float: left;
    border: none;
    outline: none;
    background: transparent;
    background-color: #8ED074;
    background-repeat:  no-repeat;
}
.footer1{background-image: url("../img/1.png");}
.footer2{background-image: url("../img/2.png");}
.footer3{background-image: url("../img/3.png");}
.footer4{background-image: url("../img/4.png");}
.close{
    width: 58px;
    height: 58px;
    position: absolute;
    top: 156px;
    left: 965px;
    border-radius: 50%;
    outline: none;
    border: 0;
    background: transparent;
}